Step 4: Now click on “Browse” button in Multi Download Tools and choose the RDA firmware file from Step 1.

Step 5: Once the firmware file is loaded, switch off your smartphone (remove its battery if it is removable) and connect it to your computer using the original USB data cable. Once done, click on “Start All” button in Multi IEDownload Tool to start the flashing process.

Step 6: It will take few minutes for the flashing process to get finished and once it does, you will be able to see the “Success” message.

That’s it. You have successfully flashed stock ROM firmware on your Intex Aqua R4 Android device. Now use the IMEI tool provided in the firmware file and flash original IMEI of your device. Once done, unplug your device from the computer and enjoy the native Android experience again.

If you encounter any issues while following this firmware installation tutorial, do let me know via comments.